<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/_mozilla/bluetooth/bluetooth-helpers.js"></script>
<script>
'use strict';
promise_test(() => {
    window.testRunner.setBluetoothMockDataSet(adapter_type.heart_rate);
    return window.navigator.bluetooth.requestDevice({
        filters: [{services: [heart_rate.name]}],
        optionalServices: [generic_access.name]
    })
    .then(device => device.gatt.connect())
    .then(gattServer => gattServer.getPrimaryService(generic_access.name))
    .then(service => service.getCharacteristic(device_name.name))
    .then(characteristic => {
        let event = 'characteristicvaluechanged';
        let event_promise = new Promise((resolve, reject) => {
            let event_listener = (e) => {
                characteristic.removeEventListener(event, event_listener);
                resolve(e.target.value);
            };
            characteristic.addEventListener(event, event_listener);
        });
        return characteristic.readValue()
        .then(result => {
            return Promise.all([result, event_promise]);
        });
    }).then(results => {
        let read_value = results[0];
        let event_value = results[1];
        assert_array_equals(event_value, read_value);
    });
}, 'Reading a characteristic should fire an event.');
</script>
